Breathing with a fatso on you

So I have been doing BJJ for a short while now and have noticed that one of my biggest problems is breathing with someone on me.
Is their some highly effective diaphragm or core work out that would greatly help with this?

There are not to many diaphram workouts that will help with this (might be better off trying this in the basic technique section). Work on your position control, work to not let yourself get stuck flat on your back if possible and learn to calm down and breath when you're being pressed. Two yoga poses you can try to help that are plow and wind reliever posture (yes its a wrong as it sounds). They will help you learn to breath when in a restricted position. Good luck.

Also, stop hugging people who are on top of you. Most noobs wrap their arms around people and squeeze when they are on the bottom for some reason. Not only does this not help you, it makes the top guys job that much easier. He already has gravity on his side, he doesn't need your help.

Also, stop hugging people who are on top of you. Most noobs wrap their arms around people and squeeze when they are on the bottom for some reason. Not only does this not help you, it makes the top guys job that much easier. He already has gravity on his side, he doesn't need your help.

now that you point it out, and i think about it, i did that as well for a while.
about the time things turned around for me was about the time i started making space for escapses/sweeps instead of bearhugging for some stupid roll.

Lucky for me the bear hugging thing isn't a problem. While I am new to BJJ I do have some newaza experience from Judo. Also I have focused on posture and frame building. I do find it incredibly difficult to make space once someone is on me(in particular someone heavier than me). I know how to umpa and shrimp, in fact my hip ins and shrimp but by the time we get to rolling and someone has a knee on belly or the mount heck sometimes even side control I just do not have the air left in me to get myself to move.

I have noticed that some newbs "panic breathe" when they are in a tight spot. The breathing pattern is like one step slower than hyperventilating. This is obviously not effective. RELAX and calm your breathing especially when you are in a rough spot.